Do you guys have any plan to support Intel Phi in the future? That is, running MPI code on the Phi cards or across the multicore and Phi, as Intel MPI does?


Hi Michael,

Because a Xeon Phi card acts a lot like a Linux host with an x86 architecture, you can build your own Open MPI libraries to serve this purpose.

Our team has used existing (an older 1.4.3 version of) Open MPI source to build an Open MPI for running MPI code on Intel Xeon Phi cards over Intel’s (formerly QLogic’s) True Scale InfiniBand fabric, and it works quite well.  We have not released a pre-built Open MPI as part of any Intel software release.   But I think if you have a compiler for Xeon Phi (Intel Compiler or GCC) and an interconnect for it, you should be able to build an Open MPI that works on Xeon Phi. 

Tom Elken




On Sat, Jul 6, 2013 at 2:36 PM, Ralph Castain <> wrote:

Rolf will have to answer the question on level of support. The CUDA code is not in the 1.6 series as it was developed after that series went "stable". It is in the 1.7 series, although the level of support will likely be incrementally increasing as that "feature" series continues to evolve.

On Jul 6, 2013, at 12:06 PM, Michael Thomadakis <> wrote:

> Hello OpenMPI,
> I am wondering what level of support is there for CUDA and GPUdirect on OpenMPI 1.6.5 and 1.7.2.
> I saw the ./configure --with-cuda=CUDA_DIR option in the FAQ. However, it seems that with configure v1.6.5 it was ignored.
> Can you identify GPU memory and send messages from it directly without copying to host memory first?
> Or in general, what level of CUDA support is there on 1.6.5 and 1.7.2 ? Do you support SDK 5.0 and above?
> Cheers ...
> Michael

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